Airbag control unit with part number 52058549

What does the airbag control unit 52058549 do?

The airbag control unit 52058549 forms the switching centre of the SRS restraint system of Fiat. It processes the signals from the crash sensors, decides within milliseconds in an accident which airbags and seatbelt pretensioners are triggered, and monitors the entire installation without interruption.

If the unit detects a fault, it switches on the airbag warning light in the instrument cluster. This makes it recognisable at a glance that something is wrong with the restraint system.

After an accident the unit stores crash data and locks itself.

Why does the control unit 52058549 fail?

Stored crash data from an accident is the most common cause, even if no airbag has deployed. Other causes are aged electronic components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

The crash data remains in the memory until it is erased. An ordinary diagnostic tool cannot do that. Airbag24 erases this data during the repair.

The other causes lie in the electronics themselves and in their connections. Components age, solder joints may have gone cold, and moisture attacks plug contacts. Voltage spikes occur, for example, with a weak battery or when a jump start is connected.

How can you tell that the 52058549 is defective?

The airbag warning light in the instrument cluster stays on permanently or intermittently, a fault message appears in the instrument cluster, the diagnostic tool does not find the control unit, and the fault memory cannot be cleared.

Typical signs at a glance:

• Airbag warning light on permanently
• Airbag warning light only on intermittently
• Fault message in the instrument cluster
• No connection between the diagnostic tool and the control unit
• Fault memory cannot be cleared

In such a case airbags and seatbelt pretensioners may not trigger in an emergency. Therefore have the fault memory read out promptly.

Which vehicles is the 52058549 fitted in?

The control unit 52058549 is fitted in these vehicles: Fiat 500L 199 Facelift (2017-2022) and 199 (2012-2017).

The vehicles stored for this part are listed here:

• Fiat 500L 199 Facelift (2017-2022)
• Fiat 500L 199 (2012-2017)

Separate steps help with the assignment. Compare the part number on the label of the removed unit with this page, which only confirms that it is the correct unit. Also have the fault memory read out beforehand, because only then does it show whether the control unit is defective or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 51943893, 51963734, A2C81350100.

How does the repair of the 52058549 work?

First have the fault memory read out and attach the log. Then disconnect the battery and only then remove the control unit. Only then create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked on the test bench, and defective components are replaced. Afterwards Airbag24 deletes the stored crash data and carries out a function test.

Processing at Airbag24 usually takes 3–4 working days. Afterwards your own unit goes back to you. Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 52058549 get to Airbag24?

You send the control unit in as a parcel or book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Put the printed repair order in the parcel. Pack the unit shock-proof so that it reaches its destination safely.